Flask for laboratory purposes



Feb. 14, 1928. 1,659,383

H. THIENE ET AL FLASK FOR LABORATORY PURPOSES Filed Dec. 18. 1926 Fen "t l,

EERMANN EHIENE, JPA'UL "if. PRAUSNI'IZ, AND GEEHABD SCHOTL, @F J'E'NA, GEE- llliln'flllf, .ASSIGNORS TO FIRM J'ENAER GLASWERK SCJHGTIE' dz U1 HENA,

GERMANY.

FOR LABORATORY PURPOSES.

Application filed December 18, 1926, Seriallto. 155,?15t, and in Germany December MB, 19%..

The present invention relates to flasks for laboratory purposes, e. g. the so-called llrlenmayer flasks. According to the invention the bottom end of such flasks is provided with an oblique, downwardly directed flattening. This afi'ords the possibility of placing such a flask in an oblique direction which, e. g. allows any sediment to settle down in the flask and then admits of pourto ing out its contents without simultaneously stirring up again the sediment. Instead of only one of these flattenings it is, of course, also possible to provide several of them. If the remaining part of the bottom end to of the flask be given the shape of a conical stump whose small end surface is downwardly directed, the flask may be placed into an oblique position either on the said flattening or on any of the surface lines of an the cone. Although it would be able to roll on the surface of the cone it is stationary in the .direction of the meridional plane to which the respective surface line appertains. Besides, this kind of construction has the an advantage that it is less easy to completely upset the flask because with an inclination o' the flask with which it does no longer tend to return to its bottom surface it is first brought into a second stationary position in to which it is supported by the flattening or by one of the surface lines. Moreover, such a conical surface is convenient for use as the flask may then be securely suspended in a cooking-ring. In order to attain the said advantages, the top angle of the cone must be at least 90.

The annexed drawing shows two constructional examples of the invention.

The first example (Figs. 1 and 2) illus trates a boiling flask a which is provided with a flattening b. In Fig. 1 the flask stands on its ordinary base, in Fig. 2 on the flattening 5.

The second example (Figs. 3 and 4) is a flask 0 whose bottom end consists of a conical stump d in which the top angle is about 100. A flattening b is provided on this stump. Fig. 3 shows the flask, standing on its ordinary base, whilst in Fig. 4 it rests upon one of the surface'lines of the conical stump d.

We claim:

Flask for laboratory purposes, whose bottom end consists of a conical stump, the smaller end surface of which is downwardly directed and in which the top angle is at least 90, which stump presents a base perpendicular to the axis of the flask, the said stump being provided with a flattening, the rim of which lies in a downwardly directed plane, so as to present a second base oblique to the said axis.

HERMANN THIENE. PAUL H. PRAUSNITZ. GERHARD SCHOTT. 

